Abstract

Odor modification is defined by the impact of one odorous substance upon another, thereby altering the perception of the primary odor in some manner. This phenomenon can occur in different ways. The masking of an odor results when the original odor is compounded with an additional odor, and an overall increased perception in intensity is realized. Counteraction occurs when the perception of the combination of the two odorants results in an overall decreased perception in intensity. Both of these relationships are reviewed in detail. Initially, this article examines the basic mechanism of olfaction, classification of odors, and how odor counteraction is evaluated. Finally, it touches upon the use of odors to modify not only the perception of other odors but human behavior as well.